Read by QxMD icon Read

Knee adductor moment

Derek J Rutherford, Janice Moreside, Ivan Wong
Background: Femoroacetabular impingement (FAI) is a recognized cause of hip and groin pain and a significant factor in hip joint function during sport. Objective tests for understanding hip function are lacking in this population. Purpose: To determine whether biomechanical and electromyographic features of hip function during level-ground walking differ between a group diagnosed with FAI and those with no symptoms of FAI. Study Design: Controlled laboratory study...
May 2018: Orthopaedic Journal of Sports Medicine
Hunter J Bennett, Joshua T Weinhandl, Kristina Fleenor, Songning Zhang
Static frontal plane tibiofemoral alignment is an important factor in dynamic knee alignment and knee adduction moments. However, little is known about the relationship between alignment and compartment contact forces or muscle control strategies. The purpose of this study was to estimate medial (MCF) and lateral (LCF) compartment knee joint contact forces and muscle forces during stair ascent using a musculoskeletal model implementing subject specific knee alignments. Kinematic and kinetic data from 20 healthy individuals with radiographically confirmed varus or valgus knee alignments were simulated using alignment specific models to predict MCFs and LCFs...
March 12, 2018: Journal of Biomechanical Engineering
Enda F Whyte, Chris Richter, Siobhan OʼConnor, Kieran A Moran
Whyte, EF, Richter, C, O'Connor, S, and Moran, KA. Investigation of the effects of high-intensity, intermittent exercise and unanticipation on trunk and lower limb biomechanics during a side-cutting maneuver using statistical parametric mapping. J Strength Cond Res 32(6): 1583-1593, 2018-Anterior cruciate ligament (ACL) injuries frequently occur during side-cutting maneuvers when fatigued or reacting to the sporting environment. Trunk and hip biomechanics are proposed to influence ACL loading during these activities...
June 2018: Journal of Strength and Conditioning Research
Hésojy Gley Pereira Vital da Silva, Alessandro Rozim Zorzi, Heglayne Pereira Vital da Silva, João Batista de Miranda
BACKGROUND: Biomechanical gait changes are proposed as adaptations to medial knee osteoarthritis (OA), and little is known about which parameters can be modified early by high tibial osteotomy (HTO) surgery. The aim of this study was to identify early gait changes in a postoperative period of 6 months as compared to a control group, in three different spatial planes. METHODS: Twenty-one patients with OA were submitted to three-dimensional gait analysis preoperatively and 6 months after HTO surgery...
December 12, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
Ross A Bogey, Lee A Barnes
The force of a single muscle is not directly measurable without invasive methods. Yet invasive techniques are not appropriate for clinical use, thus a non-invasive technique that combined the electromyographic (EMG) signal and a neuromuscular model was developed to determine in vivo active muscle forces at the hip. The EMG-to-force processing (EFP) model included active and passive moment components, and the net EFP moment was compared with the hip moment obtained with standard inverse dynamics techniques ("gold standard")...
October 12, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Bhupinder Singh, Huy Vo, Shelby L Francis, Kathleen F Janz, H John Yack
PURPOSE: This study assessed the biomechanical gait changes in obese and normal-weight female adult subjects after a commonly recommended 30-min walking session. Hip and knee adduction and extensor moments, which are the primary modulators of frontal and sagittal plane load distribution, were hypothesized to increase in obese females after a 30-min walking period, resulting in more stress across the hip and knee joint. METHODS: Ten obese (37.7 ± 4.8 yr of age, body mass index [BMI] = 36...
March 2017: Medicine and Science in Sports and Exercise
Ross A Bogey, Lee A Barnes
The force of a single muscle is not directly measurable without invasive methods. Yet invasive techniques are not appropriate for clinical use, thus a non-invasive technique that combined the electromyographic (EMG) signal and a neuromuscular model was developed to determine in vivo active muscle forces at the hip. The EMG-to-force processing (EFP) model included active and passive moment components, and the net EFP moment was compared with the hip moment obtained with standard inverse dynamics techniques ("gold standard")...
October 12, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Bhupinder Singh, Megan G Negatu, Shelby L Francis, Kathleen F Janz, H John Yack
The purpose of this study was to determine how an overweight or obese child's cardiorespiratory fitness level and a state of fatigue affect gait biomechanics. METHODS: Using a three-dimensional motion analysis system, twenty-nine (female and male) overweight and obese children aged 8-11 years walked on force plates before and after being fatigued from the Progressive Aerobic Cardiovascular Endurance Run (PACER) protocol. Joint moments were calculated for the knee and hip in the frontal and sagittal planes...
October 2016: Gait & Posture
Guilherme M Cesar, Curtis L Tomasevicz, Judith M Burnfield
The potential to use the vertical jump (VJ) to assess both athletic performance and risk of anterior cruciate ligament (ACL) injury could have widespread clinical implications since VJ is broadly used in high school, university, and professional sport settings. Although drop jump (DJ) and VJ observationally exhibit similar lower extremity mechanics, the extent to which VJ can also be used as screening tool for ACL injury risk has not been assessed. This study evaluated whether individuals exhibit similar knee joint frontal plane kinematic and kinetic patterns when performing VJs compared with DJs...
November 2016: Sports Biomechanics
D McClelland, D Barlow, T S Moores, C Wynn-Jones, D Griffiths, P J Ogrodnik, P B M Thomas
In arthritis of the varus knee, a high tibial osteotomy (HTO) redistributes load from the diseased medial compartment to the unaffected lateral compartment. We report the outcome of 36 patients (33 men and three women) with 42 varus, arthritic knees who underwent HTO and dynamic correction using a Garches external fixator until they felt that normal alignment had been restored. The mean age of the patients was 54.11 years (34 to 68). Normal alignment was achieved at a mean 5.5 weeks (3 to 10) post-operatively...
May 2016: Bone & Joint Journal
Anne Khuu, Eric Foch, Cara L Lewis
BACKGROUND: The single leg squat (SLS) is a functional task used by practitioners to evaluate and treat multiple pathologies of the lower extremity. Variations of the SLS may have different neuromuscular and biomechanical demands. The effect of altering the non-stance leg position during the SLS on trunk, pelvic, and lower extremity mechanics has not been reported. PURPOSE: The purpose of this study was to compare trunk, pelvic, hip, knee, and ankle kinematics and hip, knee, and ankle kinetics of three variations of the SLS using different non-stance leg positions: SLS-Front, SLS-Middle, and SLS-Back...
April 2016: International Journal of Sports Physical Therapy
Monica R Maly, Stacey M Acker, Saara Totterman, José Tamez-Peña, Paul W Stratford, Jack P Callaghan, Jonathan D Adachi, Karen A Beattie
The objective was to determine the extent to which the external peak knee adduction moment (KAM) and cumulative knee adductor load explained variation in medial cartilage morphology of the tibia and femur in knee osteoarthritis (OA). Sixty-two adults with clinical knee OA participated (61.5 ± 6.2 years). To determine KAM, inverse dynamics was applied to motion and force data of walking. Cumulative knee adductor load reflected KAM impulse and loading frequency. Loading frequency was captured from an accelerometer...
September 18, 2015: Journal of Biomechanics
K Manal, E Gardinier, T S Buchanan, L Snyder-Mackler
OBJECTIVE: To evaluate if the peak knee flexor moment (pKFM) provides unique and meaningful information about peak medial compartment loading above and beyond what is obtained from the peak knee adduction moment. METHODS: Standard video-based motion capture and EMG recordings were collected for 10 anterior cruciate ligament (ACL) reconstructed subjects walking at a self-selected speed. Knee joint moments were obtained using inverse dynamics and medial contact force was computed using an EMG-driven musculoskeletal model...
July 2015: Osteoarthritis and Cartilage
E Klum, H Streicher, H Böhm, P Wagner, L Döderlein
BACKGROUND: Adolescents with cerebral palsy often complain about a Duchenne gait, which increases the load on the spine, the energy consumption and therefore decreases gait efficiency. However the underlying causes of a Duchenne gait in patients with CP are not clearly researched yet. Nevertheless there is an assumption that excessive trunk lean might assist foot clearance to compensate for muscle weakness or contractures of the legs. In particular weakness, secondary to surgical soft tissue muscle tendon lengthening in childhood, might predispose patients to greater compensatory movements of the trunk...
February 2015: Zeitschrift Für Orthopädie und Unfallchirurgie
Paul Pei-Hsi Chou, Yen-Po Huang, Yi-Hsuan Gu, Chiang Liu, Shen-Kai Chen, Kai-Cheng Hsu, Rong-Tyai Wang, Ming-Jer Huang, Hwai-Ting Lin
Repetitive overhead throwing may result in overuse injuries and a change in the pitching mechanics of a baseball pitcher. Accordingly, the purpose of this study is to quantify the changes in the muscle strength and pitching motion kinematics in the late-innings stage of a baseball game. Sixteen healthy baseball pitchers (16.77 ± 0.73 years) recruited from a high school, which won the National High School Baseball Championship in Taiwan in 2011; each performed 100 pitches in a bullpen throwing session. Isometric muscle strength measurements and joint kinematic data were obtained before and after the throwing session...
June 2015: Journal of Strength and Conditioning Research
Elizabeth Russell Esposito, Jason M Wilken
BACKGROUND: Gait compensations following transtibial amputation negatively affect sound limb loading and increase the risk of knee osteoarthritis. Push-off assistance provided by new powered prostheses may decrease the demands on the sound limb. However, their effects in a young population in the early stages of prosthetic use are still unknown. The purpose of this study was to compare limb loading between 1. passive and powered ankle-foot prostheses, 2. sound and amputated limbs, and 3...
December 2014: Clinical Biomechanics
Kathryn L Havens, Susan M Sigward
PURPOSE: Quick changes of direction during running (cutting) are necessary for successful performance of many sports but are associated with noncontact anterior cruciate ligament (ACL) injuries. Currently, it is not known how biomechanics associated with fast performance of cutting tasks relate to the mechanics associated with increased risk for injury. Without this knowledge, the technique emphasized in injury prevention programs may be at odds with the demands of cutting tasks. The purposes of this study were to 1) identify whole body and/or joint mechanics that are related to completion times of 45° and 90° cuts and, from these variables, 2) determine which variables are predictors of performance (i...
April 2015: Medicine and Science in Sports and Exercise
Jae P Yom, Kathy J Simpson, Scott W Arnett, Cathleen N Brown
One potential ACL injury situation is due to contact with another person or object during the flight phase, thereby causing the person to land improperly. Conversely, athletes often have flight-phase collisions but do land safely. Therefore, to better understand ACL injury causation and methods by which people typically land safely, the purpose of this study was to determine the effects of an in-flight perturbation on the lower extremity biomechanics displayed by females during typical drop landings. Seventeen collegiate female recreational athletes performed baseline landings, followed by either unexpected laterally-directed perturbation or sham (nonperturbation) drop landings...
October 2014: Journal of Applied Biomechanics
Raghav K Varma, Lynsey D Duffell, Dinesh Nathwani, Alison H McGregor
OBJECTIVES: Prior injury to the knee, particularly anterior cruciate ligament (ACL) injury, is known to predispose one to premature osteoarthritis (OA). The study sought to explore if there was a biomechanical rationale for this process by investigating changes in external knee moments between people with a history of ACL injury and uninjured participants during walking: (1) on different surface inclines and (2) at different speeds. In addition we assessed functional differences between the groups...
June 4, 2014: BMJ Open
Abeer M Eldeeb, Amr S Khodair
BACKGROUND: There's lack in the literature respecting changes in the trunk and hip angles, and power profile of the lower extremities in postmenopausal women with low bone mineral density (BMD). Therefore, this study aimed to examine gait characteristics of that population, and find out which characteristics may be predictors to BMD. This may provide suitable interventions for subjects with osteoporosis. METHODS: Seventeen healthy postmenopausal women and seventeen with low BMD engaged in this study...
2014: Journal of Neuroengineering and Rehabilitation
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"